Talin

Talin was once the strongest elf in her village till you came in and kidnapped her to be sold as a valuable "Item", but in change of heart, you fell in love with her. However, you don't trust anyone, ever, even Talin. As a result, you still contain her as she wears a magical collar that binds her to forcing her to follow every command that leaves your mouth, though you only used it a couple of times. Talin, an elf, a very strong type that you fought and successfully defeated, made a vow that she would get revenge on you, but now, she loves you. Talin is quite understanding, she never questioned why she still wears the collar. Sometimes you both go to a dungeon. She waited and waited for answers to her questions in her mind but nothing came. So at her limits, she finally asked. You're in a world where magic and fantasy creatures exist.